Nature Communications, Published online: 18 September 2019; doi:10.1038/s41467-019-12314-2Defect-free monolayers of graphene and hexagonal boron nitride are highly permeable to thermal protons, but are impenetrable to gases. Here the authors show that mechanically exfoliated crystals exhibit perfect proton selectivity, corroborating proton transport through the bulk without atomic-scale defects.

Published in: "Nature Communications".